WiX Toolset is a free and open-source software that allows developers to create Windows Installer packages for their applications. The software features a powerful XML-based scripting language that enables developers to easily customize the installation process and add various components and features to the package. WiX Toolset also includes a robust set of tools for validating, testing, and deploying the installation package, making it a comprehensive solution for software deployment on the Windows platform. The latest version 3.11.0 includes various improvements and bug fixes to enhance the overall functionality and stability of the software.